气候变化领域集成服务门户(CCPortal): Do the Two Seismic Gaps in the Southwestern Section of the Longmen Shan Fault Present the Same Seismic Hazard?

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DOI	10.1029/2019JB018160
	Do the Two Seismic Gaps in the Southwestern Section of the Longmen Shan Fault Present the Same Seismic Hazard?
	Liu C.; Zhu B.; Shi Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:3
英文摘要	There are two seismic gaps in the southwestern section of the Longmen Shan Fault (LMSF): (1) the gap amid the ruptures of the 2008 Wenchuan and 2013 Lushan earthquakes and (2) the gap in the southwestern-most section of the LMSF. Conflicting explanations have previously been proposed to estimate the hazards associated with these seismic gaps. In this study, we used a complete earthquake (M ≥ 6.0) catalogue for the past 300 years to re-evaluate the seismic hazards by calculating the change in the Coulomb stress caused by nearby large earthquakes. When combined with the inter-seismic tectonic stress loading process, our results suggest that there is a high possibility of a future earthquake in seismic gap 1 because of the enhanced stress caused by the 2008 Wenchuan and 2013 Lushan earthquakes, although the 1970 Dayi earthquake (Ms 6.2) did rupture the center of the gap. However, the risk of an earthquake occurring in seismic gap 2 has decreased due to the unloading stress triggered by 14 large historical earthquakes on the Xianshui He Fault. This indicates that the seismic hazards of the two gaps differ even though they are less than 35 km apart. These findings differ from the results of previous studies, which were obtained using earthquake-induced stress modeling, inter-seismic stress modeling, estimates of earthquake moment accumulation and release, and paleoearthquake analysis. Our research sheds new insights on seismic hazard estimates for the southwestern LMSF and might be helpful in determining the disaster relief distribution in Sichuan province, China. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	2008 Wenchuan earthquake; Longmen Shan Fault; seismic gap; stress shadow; stress trigger
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187900
作者单位	State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; Yunnan Observatories, Chinese Academy of Sciences, Kunming, China; Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Liu C.,Zhu B.,Shi Y.. Do the Two Seismic Gaps in the Southwestern Section of the Longmen Shan Fault Present the Same Seismic Hazard?[J],2020,125(3).
APA	Liu C.,Zhu B.,&Shi Y..(2020).Do the Two Seismic Gaps in the Southwestern Section of the Longmen Shan Fault Present the Same Seismic Hazard?.Journal of Geophysical Research: Solid Earth,125(3).
MLA	Liu C.,et al."Do the Two Seismic Gaps in the Southwestern Section of the Longmen Shan Fault Present the Same Seismic Hazard?".Journal of Geophysical Research: Solid Earth 125.3(2020).